Digital camera with projector and digital camera system

ABSTRACT

A digital camera equipped with a projector, includes a photographing device; a projector device that projects an optical image; a mode switching operation member that outputs a switching operation signal indicating a changeover to one of a photographing operation mode in which image data photographed by the photographing device are saved as a photographic image file in a recording medium and a projection operation mode in which a reproduced image is projected by the projector device; a top surface operation member disposed at an upper surface of a casing; and a projection control device that controls the projector device based upon an operation signal provided by the top surface operation member upon receiving a switching operation signal indicating a changeover to the projection operation mode from the mode switching operation member.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.11/348,250, filed Feb. 7, 2006, now U.S. Pat. No. 7,653,304, whichfurther claims the benefit of priority of Japanese Patent ApplicationNo. 2005-031943 filed Feb. 8, 2005 and Japanese Patent Application No.2005-257694 filed Sep. 6, 2005, the contents being incorporated hereinby reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a digital camera equipped with aprojector that projects an optical image, and a digital camera system.

2. Description of the Related Art

Japanese Laid Open Patent Publication No. H8-146512 discloses acomposite camera equipped with a projector function. As a projectionmode switch or a video play button is operated, the composite camerashifts into a mode in which the projector is engaged in operation.

However, after the composite camera disclosed in the publication isswitched to the projection operation mode to engage the projector devicein operation, further operations such as a selection of an image to beprojected must be executed before the image is actually projected andthus, the camera does not assure the maximum operability.

SUMMARY OF THE INVENTION

A digital camera equipped with a projector according to a first aspectof the present invention includes a photographing device; a projectordevice that projects an optical image; a mode switching operation memberthat outputs a switching operation signal indicating a changeover to oneof a photographing operation mode in which image data photographed bythe photographing device are saved as a photographic image file in arecording medium and a projection operation mode in which a reproducedimage is projected by the projector device; a top surface operationmember disposed at an upper surface of a casing; and a projectioncontrol device that controls the projector device based upon anoperation signal provided by the top surface operation member uponreceiving a switching operation signal indicating a changeover to theprojection operation mode from the mode switching operation member.

A digital camera equipped with a projector according to the first aspectmay further include a photographing control device that controls thephotographing device upon receiving a switching operation signalindicating a changeover to the photographing operation mode from themode switching operation member, and it is preferable that the topsurface operation member includes a shutter release operation memberthat outputs operation signals each corresponding to a halfway pressoperation mode or a full press operation mode; and the photographingcontrol device controls the photographing device so as to executephotographing processing in correspondence to a signal indicating one ofthe halfway press operation mode and the full press operation modeprovided by the shutter release operation member. The projection controldevice may issue one of a focus adjustment start instruction, areproduced image projection instruction, a projection image rotationinstruction and a projection pause instruction for the projector devicebased upon a signal indicating one of the halfway press operation modeand the full press operation mode provided by the shutter releaseoperation member and a length of time over which the signal issustained.

A digital camera equipped with a projector according to the first aspectmay further include a photographing control device that controls thephotographing device upon receiving a switching operation signalindicating a changeover to the photographing operation mode from themode switching operation member, and it is preferable that the topsurface operation member includes a selective operation member thatselectively outputs one of various operation signals; the photographingcontrol device controls the photographing device so as to execute zoomadjustment in correspondence to an operation signal provided by theselective operation member; and the projection control device controlsthe projector device so as to execute zoom adjustment in correspondenceto an operation signal provided by the selective operation member. Thephotographing control device may control the photographing device so asto execute zoom adjustment in correspondence to an operation signalprovided by the selective operation member; and the projection controldevice may control the projector device so as to execute focusadjustment in correspondence to an operation signal provided by theselective operation member. The photographing control device may controlthe photographing device so as to execute zoom adjustment incorrespondence to an operation signal provided by the selectiveoperation member; and the projection control device may control theprojector device so as to forward or reverse a frame of a projectionimage in correspondence to an operation signal provided by the selectiveoperation member. The photographing control device may control thephotographing device so as to execute zoom adjustment in correspondenceto an operation signal provided by the selective operation member; andthe projection control device may control the projector device so as toexecute keystone correction adjustment in correspondence to an operationsignal provided by the selective operation member.

In a digital camera equipped with a projector according to the firstaspect, upon receiving a switching operation signal indicating achangeover to the projection operation mode from the mode switchingoperation member, the projection control device may control theprojector device so as to automatically reproduce and project insequence a plurality of photographic image files saved in the recordingmedium after executing projection adjustment processing corresponding toan operation signal provided from the top surface operation member.

A digital camera equipped with a projector according to the first aspectmay further include a retracting device that retracts a photographicoptical system, and it is preferable that upon receiving a switchingoperation signal indicating a changeover to the projection operationmode from the mode switching operation member, the projection controldevice issues an instruction for the retracting device to retract thephotographic optical system.

A digital camera system according to a second aspect of the presentinvention includes a photographing device; a top surface operationmember disposed at an upper surface of a casing of a digital camera; aprojector device that projects an optical image; and a projectioncontrol device that controls the projector device based upon anoperation signal provided from the top surface operation member.

A digital camera system according to the second aspect may include thedigital camera that includes the photographing device and the topsurface operation member; and a digital camera auxiliary device thatcomprises the projector device, the projection control device and aninterface device engaged in communication with the digital cameramounted at the digital camera auxiliary device, and it is preferablethat upon detecting that the digital camera is mounted, the projectioncontrol device automatically sets the projector device in aprojection-ready state and engages the projector device to sequentiallyproject images reproduced based upon a plurality of photographic imagefiles saved in a recording medium in the digital camera. As the digitalcamera is mounted, the digital camera auxiliary device may output aninstruction signal for the digital camera to retract a photographicoptical system.

A digital camera system according to the second aspect may include thedigital camera that includes the photographing device and the topsurface operation member; and a digital camera auxiliary device thatcomprises the projector device, the projection control device and aninterface device engaged in communication with the digital cameraelectrically connected to the digital camera auxiliary device, and it ispreferable that upon receiving a signal indicating that the digitalcamera is set in a reproduction mode, the projection control deviceautomatically sets the projector device in a projection-ready state andengages the projector device to sequentially project images reproducedbased upon a plurality of photographic image files saved in a recordingmedium in the digital camera.

A digital camera system according to the second aspect may include thedigital camera that includes the photographing device, the top surfaceoperation member, the projector device and the projection controldevice; and a digital camera auxiliary device that comprises aninterface device used to at least either communicate with the digitalcamera mounted thereat or supply power to the digital camera mounted atthe digital camera auxiliary device, and upon detecting that the digitalcamera is mounted at the digital camera auxiliary device, the projectioncontrol device may automatically engage the projector device tosequentially project images reproduced based upon a plurality ofphotographic image files saved in a recording medium.

A digital camera system according to the second aspect may include adigital camera auxiliary device that comprises an interface device usedto at least either communicate with the digital camera mounted at thedigital camera auxiliary device or to supply power to the digital cameramounted at the digital camera auxiliary device; and the digital camerathat includes the photographing device, the top surface operationmember, the projector device, the projection control device, aretracting device that retracts a photographic optical system and aretraction control device that issues an instruction for the retractingdevice to retract the photographic optical system upon detecting thatthe digital camera is mounted at the digital camera auxiliary device,and upon detecting that the digital camera is mounted at the digitalcamera auxiliary device, the projection control device may issue aninstruction for the projector device to start projection.

In a digital camera equipped with a projector according to the firstaspect, it is preferable that the top surface operation member includesa shutter release operation member that outputs operation signals eachcorresponding to a halfway press operation mode or a full pressoperation mode and a rotary selective operation member that selectivelyoutputs one of various operation signals. A function adjustment devicemay be further provided that individually adjusts functions of theshutter release operation member and the selective operation member inresponse to a switching operation signal provided by the mode switchingoperation member.

A digital camera equipped with a projector according to the first aspectmay further include a photographing control device that controls thephotographing device upon receiving a switching operation signalindicating a changeover to the photographing operation mode from themode switching operation member; and a side surface operation memberdisposed at a side surface of the casing, and it is preferable that thephotographing control device controls the photographing device inresponse to operation signals provided by the top surface operationmember and the side surface operation member.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective of a digital camera equipped with a projectorachieved in a first embodiment of the present invention, viewed from thefront side;

FIG. 2 is a perspective of the digital camera equipped with theprojector in FIG. 1, viewed from the rear side;

FIG. 3 is a block diagram of the structure adopted in the digital cameraequipped with the projector;

FIG. 4 presents a flowchart of program processing executed by a CPU in aprojection mode;

FIG. 5 presents an example of projection of a laterally oriented image;

FIG. 6 shows a projection image having undergone rotation processing andreduction processing;

FIG. 7 is a block diagram of the structure adopted in a digital camerasystem achieved in a second embodiment;

FIG. 8 is a block diagram of the structure adopted in a digital camerasystem achieved in a third embodiment;

FIG. 9 is a perspective of a digital camera equipped with a projectorachieved in a fourth embodiment of the present invention, viewed fromthe front side;

FIG. 10 is a perspective of the digital camera equipped with theprojector in FIG. 9, viewed from the rear side;

FIG. 11 is a block diagram of the structure adopted in the digitalcamera equipped with the projector;

FIG. 12 presents a flowchart of program processing executed by a CPU ina projection mode; and

FIG. 13 presents a detailed flowchart of the projection adjustmentprocessing.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The following is an explanation of the preferred embodiments forcarrying out the present invention, given in reference to the drawings.

First Embodiment

FIG. 1 is a perspective of a digital camera equipped with a projector,which is achieved in the first embodiment of the present invention,viewed from the front side of the digital camera (toward the subject).As shown in FIG. 1, a photographic lens 11, an illuminating light window12 and a projection window 13 are disposed at the front of an digitalcamera 10 equipped with the projector. At the top surface (the surfaceof the casing turned to the upper side when the digital camera 10 isheld sideways) of the digital camera 10 equipped with the projector, ashutter release button 14, a mode selector dial 15 and a main switch 16are disposed.

FIG. 2 is a perspective of the digital camera equipped with theprojector in FIG. 1, viewed from the rear side (toward thephotographer). As shown in FIG. 2, a liquid crystal display unit 17, anelectronic viewfinder 18, operation members 19 and speaker holes 20 aredisposed at the rear surface of the digital camera 10 equipped with theprojector. It is to be noted that the operation members 19 may bereferred to as a side-surface operation member disposed at a surface(side surface) other than the top surface of the casing.

The digital camera 10 equipped with the projector includes a projectordevice (projector unit) to be detailed later. The projector deviceprojects information such as images through the projection window 13toward a screen or the like disposed to the front of the digital camera10 equipped with the projector, which may be set on, for instance, adesk. In addition, the digital camera 10 equipped with the projectorincludes a built-in speaker 21 disposed behind the speaker holes 20 soas to reproduce information such as sound toward the rear of the digitalcamera 10.

The mode selector dial 15 is a mode switching operation member operatedto switch the operation mode of the digital camera 10 equipped with theprojector to a photographing mode, a projection mode or the like. In thephotographing mode, a subject image is photographed and the photographicimage data are saved into a recording medium constituted with a memorycard or the like as a photographic image file. If a still image has beenphotographed, a still image file is generated, whereas if a dynamicimage has been photographed, a dynamic image file is generated. In thephotographing operation mode, the digital camera 10 equipped with theprojector is most likely to be hand held by the photographer. Anoperation signal output in response to a depression of the shutterrelease button 14 is equivalent to a photographing start instruction. Anilluminating device to be detailed later is mounted at the digitalcamera 10 equipped with the projector and light emitted from a lightemitting member such as a xenon tube is output toward the front side ofthe digital camera 10 equipped with the projector through theilluminating light window 12. Audio data collected via a built-inmicrophone disposed together with the speaker 21 behind the speakerholes 20, too, can be saved into the recording medium in thephotographing mode.

In the projection mode, an image reproduced by using image data that mayhave been obtained through a previous photographing operation and readout from a recording medium (e.g., a memory card 250 to be detailedlater or an internal memory (not shown)) is projected by the projectorunit through the projection window 13. The corresponding audio data arereproduced via the speaker 21 mentioned earlier in the projection mode.It is to be noted that an image reproduced by using image data read outfrom a source other than a recording medium or image data provided froma source outside the digital camera 10 equipped with the projector canalso be projected in the projection mode.

The digital camera 10 equipped with the projector includes a retractingmechanism for retracting a lens barrel P into the camera casing so as toensure that light projected through the projection window 13 does notbecome eclipsed at the lens barrel P of the photographic lens 11.

FIG. 3 is a block diagram of the structure adopted in the digital camera10 equipped with the projector described above. As shown in FIG. 3, thedigital camera 10 equipped with the projector includes a projector unit120, an imaging unit 220, a CPU 101, a memory 102, an operation member103, a liquid crystal display unit 104, a speaker 105, a microphone 106,an external interface (I/F) 107 and an illuminating device 108. A memorycard 250 and an optional tuner card 255 are loaded in card slots (notshown). These cards can be loaded/unloaded freely.

The CPU 101 controls the photographing operation and the projectionoperation based upon a control program by executing specific arithmeticoperations based upon signals input from the individual unitsconstituting the digital camera 10 equipped with the projector andproviding the resulting control signals to the various units of thedigital camera 10 equipped with the projector. It is to be noted thatthe control program is stored in a nonvolatile memory (not shown) withinthe CPU 101.

The memory 102 is utilized as a work area by the CPU 101. The operationmember 103 corresponds to the main switch 16, the shutter release button14 and the mode selector dial 15 in FIG. 1 and also corresponds to theoperation members 19 in FIG. 2. Operation signals corresponding tospecific operation details are transmitted from the operation member 103to the CPU 101.

The memory card 250 is constituted with a nonvolatile memory such as aflash memory, and data such as image data obtained by the imaging unit220 through a photographing operation can be written and saved into thememory card 250 or such image data can be read out from the memory card250 in response to a command issued by the CPU 101. The tuner card 255receives and modulates television broadcast signals and the image dataand the audio data having undergone the modulation process are thenoutput to the CPU 101.

The illuminating device 108 engages the light emission member in lightemission in response to a light emission instruction output by the CPU101 and radiates illuminating light to be used to illuminate the subjecttoward the area out in front of the digital camera 10 equipped with theprojector through the illuminating light window 12.

At the liquid crystal display unit 104 (which corresponds to referencenumeral 17 in FIG. 2), information such as an image or text is displayedin response to a command issued by the CPU 101. The text informationdisplayed at the liquid crystal display unit 104 may indicate theoperating state of the digital camera 10 equipped with the projector, orit may be an operation menu or the like. Sound is reproduced through thespeaker 105 (corresponds to reference numeral 21 in FIG. 2) by usingaudio data output by the CPU 101.

The microphone 106 converts sound having been collected to electricalsignals and outputs the electrical signals to the CPU 101. The audiosignal data are recorded into the memory card 250 in the photographingmode.

In order to enable the liquid crystal display unit 104 to display animage reproduced based upon video signals transmitted from an externalapparatus such as a video camera or enable the projector unit 120 toproject the reproduced image, the video signals are converted to imagedata and the image data resulting from the conversion are output to theCPU 101 via the external interface (I/F) 107. In addition, the externalinterface (I/F) 107 converts sound constituted with audio signalstransmitted from an external apparatus to audio data for audioreproduction at the speaker 105 and outputs the audio data resultingfrom the conversion to the CPU 101.

(Projector Unit)

The projector unit 120 includes a projection lens 121, a liquid crystalpanel 122, an LED light source 123, a projection control circuit 124 anda lens drive circuit 125. The projection control circuit 124 supplies adrive current to the LED light source 123 in response to a projectioncommand output by the CPU 101. The LED light source 123 illuminates theliquid crystal panel 122 with a brightness that corresponds to thesupplied current.

In addition, the projection control circuit 124 generates a liquidcrystal panel drive signal in correspondence to image data output fromthe CPU 101 and drives the liquid crystal panel 122 with the drivesignals thus generated. More specifically, a voltage corresponding tothe image signal is applied to each of the pixels at the liquid crystallayer. The voltage applied to the liquid crystal layer alters the liquidcrystal molecular arrangement thereby changing the light transmittanceat the liquid crystal layer. By modulating the light from the LED lightsource 123 in correspondence to the image signal as described above, anoptical image is generated through the liquid crystal panel 122.

Based upon a control signal output from the projection control circuit124, the lens drive circuit 125 drives the projection lens 121forward/backward along the direction perpendicular to the optical axis.The optical image emitted from the liquid crystal panel 122 is projectedtoward a screen or the like through the projection lens 121. It is to benoted that the projection adjustment processing for adjusting theoffset, the focus and the like of the projection image is to beexplained in detail in reference to a fourth embodiment.

In response to a command issued by the CPU 101, the projector unit 120projects an image (content) corresponding to a specific source among(source 1) through (source 4) described below. The CPU 101 outputs imagedata to be used to project an image corresponding to a specific sourceso that each time an operation signal is input from a projectionchangeover switch (such as that indicated by reference numeral 19A inFIG. 2) constituting the operation member 103, the image projection isswitched cyclically to project images corresponding to sources (1)through (4) in the order of (1)→(2)→(3)→(4)→(1) . . . . However, thesource (1) is skipped if the memory card 250 is not loaded in thedigital camera 10 equipped with the projector and the source (2) isskipped if the tuner card 255 is not loaded. In addition, the source (4)is skipped if no external apparatus is connected to the externalinterface (I/F) 107.

(1) An image reproduced based upon image data recorded in the memorycard 250

(2) A broadcast image received and modulated at the tuner card 255

(3) An image reproduced based upon image data recorded in the internalmemory (such as a nonvolatile memory within the CPU 101)

(4) An image reproduced based upon video signals input through theexternal interface (I/F) 107.

When an image corresponding to the source (1) or the source (3) is to beprojected, the CPU 101 reads out the image data corresponding to themost recent recording date (the image data most recently photographedamong the recorded image data) from the memory card 250 (or the internalmemory) and outputs the image data thus read out to the projector unit120.

When a mode for reproducing a single-frame still image is selected forthe projector unit 120 and an image corresponding to the source (1) orthe source (3) is currently projected, the CPU 101 reads out the imagedata in the frame immediately preceding the frame of the currentlyprojection image from the memory card 250 (or the internal memory) andoutputs the image data to the projector unit 120 in response to anoperation signal (e.g., a leftward operation on a cross-shaped key)input thereto from a reverse switch constituting the operation member103. As a result, the image in the frame immediately preceding thecurrently projection image is projected by the projector unit 120,replacing the initial projection image.

When an image corresponding to the source (1) or the source (3) iscurrently projected, the CPU 101 reads out the image data in the frameimmediately following the frame of the currently projection image fromthe memory card 250 (or the internal memory) and outputs the image datato the projector unit 120 in response to an operation signal (e.g., arightward operation on the cross-shaped key) input thereto from aforward switch constituting the operation member 103. As a result, theimage in the frame immediately following the currently projection imageis projected by the projector unit 120, replacing the initial projectionimage. By disposing the forward switch and the reverse switch at the topsurface of the digital camera 10 equipped with the projector, the extentof camera movement attributable to an operation of either switch isreduced and thus, the likelihood of a significant displacement of theprojection image is reduced as well.

(Imaging Unit)

The imaging unit 220 includes a photographic lens 221 (corresponds toreference numeral 11 in FIG. 1), an image sensor 222, a lens drivecircuit 223, a photographing control circuit 224 and a lens barrelretracting mechanism 225. The image sensor 222 may be a CCD or CMOSimaging element. The photographing control circuit 224 controls thedrive of the image sensor 222 and the lens drive circuit 223 based uponcommands issued by the CPU 101 and executes specific types of imageprocessing on imaging signals (electrical charge storage signals) outputfrom the image sensor 222. The image processing includes white balanceprocessing and gamma processing.

Upon receiving a zoom control signal provided by the photographingcontrol circuit 224, the lens drive circuit 223 drives the zoom lens(not shown), which constitutes the photographic lens 221, toward thetelephoto side or the wide-angle side, as indicated by the controlsignal. The photographic lens 221 forms a subject image onto the imagingsurface of the image sensor 222. The photographing control circuit 224engages the image sensor 222 to start an imaging operation, reads outthe electrical charge storage signals from the image sensor 222 once theimaging operation is completed and outputs the image data resulting fromthe image processing described above to the CPU 101.

In addition, in response to a command issued by the CPU 101, thephotographing control circuit 224 outputs a command to the lens barrelretracting mechanism 225 so as to retract the lens barrel P (see FIG. 1)of the photographic lens 221 into the casing of the digital camera 10equipped with the projector or extend the lens barrel P currentlyretracted in the casing to the photographing position (see FIG. 1).

Since the present invention is characterized by the operations executedwhen the projection mode is selected in the digital camera 10 equippedwith the projector, the following explanation focuses on the controlexecuted by the CPU 101 as the projection mode is selected.

FIG. 4 presents a flowchart of the processing executed in conformance tothe program by the CPU 101 of the digital camera 10 equipped with theprojector in the projection mode. The processing shown in FIG. 4 startsas an operation signal indicating a changeover to the projection mode isinput to the CPU 101 from the mode selector dial 15.

In step S1 in FIG. 4, the CPU 101 outputs an imaging unit OFFinstruction to the photographing control circuit 224 and also issues adisplay OFF instruction for the liquid crystal display unit 104 beforethe operation proceeds to step S2. As a result, the imaging operation atthe imaging unit 220 stops and the display at the liquid crystal displayunit 104 is turned off.

In step S2, the CPU 101 makes a decision as to whether or not the lensbarrel P is currently in a retracted state. If a signal indicating aretracted state is received from the photographing control circuit 224,the CPU 101 makes an affirmative decision in step S2 to proceed to stepS4, whereas it makes a negative decision in step S2 if a signalindicating a non-retracted state is received to proceed to step S3.

The CPU 101 outputs a retract command (instruction) to the photographingcontrol circuit 224 in step S3, and then the operation proceeds to stepS4. In step S4, the CPU 101 issues a projection start instruction to theprojection control circuit 124 and also effects a functional adjustmentfor the shutter release button 14 (see FIG. 1), before the operationproceeds to step S5. In response, the LED light source 123 is turned onat the projector unit 120.

After the function adjustment is effected by the CPU 101 in step S4, theshutter release button 14 functions as an operation member for rotatingthe orientation of the projection image instead of the operation memberthrough which photographing instructions are issued, until the functionadjustment for the shutter release button 14 (see FIG. 1) is cleared instep S11 as detailed later.

The projection image is rotated as explained below. FIG. 5 present anexample of a laterally oriented projection image. If a photographicimage photographed with the digital camera 10 equipped with theprojector held upright (vertically) is projected by setting the digitalcamera 10 equipped with the projector sideways (horizontally as shown inFIGS. 1 and 2), the reproduced image is projected with the lateralorientation, as shown in FIG. 5.

In response to an operation signal input thereto from the shutterrelease button 14 while an image is projected, the CPU 101 rotates theimage data in the memory 102 by, for instance, 90° in the clockwisedirection and outputs the image data having undergone the rotationprocessing to the projector unit 120. It is to be noted that the CPU 101also executes size conversion processing in correspondence to the aspectratio of the projection image so that the image having undergone therotation processing is contained in the projection range of theprojector unit 120. For instance, assuming the aspect ratio of theprojection image in FIG. 5 is 4 (lateral): 3 (longitudinal), the CPU 101executes data size reduction processing so as to express the imageresulting from the rotation processing with pixels, the numbers of whichare reduced to ¾ of the initial numbers of pixels both along thelongitudinal direction and the lateral direction. As a result, an imagehaving undergone both the rotation processing and the reductionprocessing is projected, as shown in FIG. 6.

The CPU 101 repeatedly executes the size conversion processing and therotation processing described above each time an operation signal isinput from the shutter release button 14. As the size conversionprocessing, reduction processing for reducing the numbers of pixelsalong the longitudinal and the lateral directions both by a factor of ¾and enlargement processing for increasing the numbers of pixels alongthe longitudinal direction and the lateral direction by a factor of 4/3are alternately executed in correspondence to the aspect ratio mentionedearlier. Accordingly, if the shutter release button 14 is operated fourtimes in a row, the projection image rotates a full cycle in theclockwise direction and after the fourth operation of the shutterrelease button 14, the size of the projection image is reset to the sizeit assumed before the shutter release button 14 was operated.

In step S5 in FIG. 4, the CPU 101 reads out the image data with the mostrecent recording date from the memory card 250 and outputs the imagedata thus read out to the projector unit 120 before the operationproceeds to step S6. Thus, an image reproduced by using the image dataoutput by the CPU 101 to the projector unit 120 is projected. It is tobe noted that while image data are read out from the memory card 250 atthe default setting, the default setting may be modified so as to readout image data from the internal memory at the CPU 101. It is also to benoted that if audio data are stored in correspondence to the data fileof the currently projection image, the CPU 101 reproduces sound throughthe speaker 105 by using the audio data. The stored image data maycontain both still image data files and dynamic image data files.

In step S6, the CPU 101 makes a decision as to whether or not a useroperation has been performed. The CPU 101 makes an affirmative decisionin step S6 if an operation signal has been input through the operationmember 103 (see FIG. 3) to proceed to step S7, whereas it makes anegative decision in step S6 if no operation signal has been inputthrough the operation member 103 to proceed to step S10.

In step S10, the CPU 101 makes a decision as to whether or not the timeis up. If a specific length of time (e.g., 5 seconds) has been countedon an internal timer, the CPU 101 makes an affirmative decision in stepS10 to return to step S5. If, on the other hand, the specific length oftime has not elapsed, a negative decision is made in step S10 to returnto step S6.

The operation returns to step S5 to execute a slide-show projection.Namely, an image reproduced by using image data read out from the memorycard 250 (or the internal memory) is projected. After 5 seconds elapses,the next image data are read out from the memory card 250 (or theinternal memory) and the image projection is updated with the imagereproduced by using the most recently read-out image data. It is to benoted that the length of the projection time per image during theslide-show projection is not necessarily 5 seconds, and the length ofthe projection time can be adjusted as desired.

In step S7, the CPU 101 makes a decision as to whether or not the useroperation is a mode switching operation. The CPU 101 makes anaffirmative decision in step S7 if the user has operated the projectionchangeover switch 19A (see FIG. 2) to proceed to step S8, whereas itmakes a negative decision in step S7 if the user has performed aprojection mode end operation instead of operating the projectionchangeover switch 19A (see FIG. 2) to proceed to step S11.

In step S8, the CPU 101 switches the source of the image data to beoutput to the projector unit 120 by one setting so that the sources areswitched in the order of; (source 1)→(source 2)→(source 3)→(source4)→(source 1) . . . , and then the operation proceeds to step S9. Instep S9, the CPU 101 makes a decision as to whether or not the imagedata to be output to the projector unit 120 originate from either thesource (1) or the source (3) (i.e., whether or not a recorded image isto be output to the projector unit 120). The CPU 101 makes anaffirmative decision in step S9 if the image data to be output to theprojector unit 120 are a recorded image and, in this case, the operationreturns to step S5. However, it makes a negative decision in step S9 ifthe image data to be output to the projector unit 120 are an image fromeither the source (2) or the source (4), e.g., an unrecorded image, toreturn to step S7.

In step S11, the CPU 101 issues a projection end instruction to theprojection control circuit 124 and clears the function adjustment at theshutter release button 14 (see FIG. 1), thereby ending the processing inFIG. 4. As the processing ends, the LED light source 123 at theprojector unit 120 goes off.

The following operational effects can be achieved in the firstembodiment described above.

(a) As the projection mode is selected in the digital camera 10 equippedwith the projector, the lens barrel P (see FIG. 1) of the photographiclens 11 (221) is retracted into the casing (step S3). Since the lensbarrel P thus moves out of the range of the angle of projection field ofthe light projected by the projector unit 120, a full projection imageis obtained.

(b) As the projection mode is selected in the digital camera 10 equippedwith the projector, the function of the shutter release button 14 isaltered so as to allow the shutter release button 14 to function as anoperation member operated to rotate the orientation of the projectionimage (step S4). As an operation signal is input from the shutterrelease button 14, the digital camera 10 equipped with the projectorfirst rotates the image data by 90° in the clockwise direction in thememory 102, executes the size conversion processing in correspondence tothe aspect ratio of the projection image so as to ensure that the imagehaving undergone the rotation processing is contained within the rangeof the projection by the projector unit 120 and projects the resultingimage through the projector unit 120. Accordingly, even when theprojection contents include both laterally (horizontally) orientedimages and longitudinally (vertically) oriented images, an uprightprojection image is obtained at all times simply by pressing down theshutter release button 14 without having to adjust the direction alongwhich the digital camera 10 equipped with the projector is set, incorrespondence to each set of contents. It is to be noted that theprojection image may be rotated along the counterclockwise directioninstead. Since the projection image is made to rotate via a switch (theshutter release button 14) disposed at the top surface of the camera 10,the projection image can be rotated without having to hold the camera byhand during a projection operation. In other words, the projection imageis rotated without using a switch disposed at a surface (e.g., the rearsurface) other than the top surface of the camera, and thus, the camerais less likely to move while the rotation operation member is operated,which, in turn, reduces the likelihood of the projection imagedisplacement.

(c) As the projection mode is selected in the digital camera 10 equippedwith the projector, it automatically projects images reproduced by usingimage data recorded in the memory card 250 in a slide-show (steps S4through S10). This means that after the camera is set in the projectionmode, the user does not need to turn on the projection lamp (the LEDlight source 123) or select an image to be projected. As a result, ahigher level of operability of the digital camera 10 equipped with theprojector is assured in the projection mode.

(d) As an operation signal is input from the projection changeoverswitch 19A (see FIG. 2), while an image is projected in the projectionmode, the digital camera 10 equipped with the projector cyclicallyswitches the projection images so as to project an image originatingfrom a specific source among the sources (1) through (4). Thus, areproduced image can be projected via the projector unit 120 regardlessof the format of the image data or the image signals input to thedigital camera 10 equipped with the projector. In addition, the image tobe projected can be selected through a simple operation.

In the example explained above, image data recorded in the memory card250 are selected and images reproduced by using the selected image dataare automatically projected in a slide-show when the digital camera 10equipped with the projector is set to the projection mode. Morespecifically, when the processing in step S5 in FIG. 4 is executed forthe first time, image data are read out from the memory card 250.Alternatively, images reproduced by using image data recorded in theinternal memory corresponding to the source (3) may be projected.

In addition, when the projection mode is selected in the digital camera10 equipped with the projector, an image corresponding to either thesource (2) or the source (4) may be selected and projected instead.

Second Embodiment

The present invention may also be adopted in a system in which arechargeable battery is used as a power source in a digital camera and aprojector device is built into a digital camera auxiliary device thatsupplies the electrical current to the digital camera to charge therechargeable battery. The digital camera auxiliary device is constitutedas a cradle through which the charging current (power) may be suppliedto the digital camera and which may project a reproduced image. Undernormal circumstances, a photographing operation is not performed whilethe digital camera is mounted at the cradle.

FIG. 7 is a block diagram of a digital camera 10 constituting thedigital camera system mounted at a cradle 20.

(Cradle)

The cradle 20 in FIG. 7 includes a projector unit 120, a CPU 151, amemory 152, an operation member 153, a video interface (VIDEO I/F) 155,a LAN interface (LAN I/F) 156, a USB interface (USB I/F) 157, anexternal power source circuit 158, a camera interface 160 and a speaker159. A detachable memory card 154 is loaded in a memory slot (not shown)formed at the casing of the cradle 20.

The CPU 151 controls the communication operation and the projectoroperation by executing specific arithmetic operations on signals inputfrom the individual units constituting the cradle 20 and providing theresulting control signals to the various units of the cradle 20 basedupon a cradle control program. It is to be noted that the cradle controlprogram is stored in a nonvolatile memory (not shown) within the CPU151.

The memory 152 is utilized as a work memory by the CPU 151. At thememory card 154 constituted with a nonvolatile memory such as a flashmemory, data can be written, saved and read out in response to commandsissued by the CPU 151.

The video interface (VIDEO I/F) 155 generates video signals to be usedto display at an external television monitor or the like an imagereproduced by using image data or video signals transmitted from thedigital camera 10A via the camera interface 160 when the digital camera10A is set on the cradle 20 or an image reproduced by image data readout from the memory card 154 when the digital camera 10A is not set onthe cradle 20. The reproduced image is displayed at the externaltelevision monitor or the like connected with the video interface (VIDEOI/F) 155.

In response to a command issued by the CPU 151, the LAN interface (LANI/F) 156 engages in data exchange with another external apparatus (e.g.,a DVD recording/reproducing apparatus, a security camera or the like)connected thereto via a LAN cable (not shown). The USB interface (USBI/F) 157 engages in data exchange with another external apparatus (e.g.,a personal computer, a printer or a photo data storage device) connectedthereto via a USB cable (not shown) in response to a command issued bythe CPU 151.

The external power source circuit 158, constituted with an AC/DCconversion circuit or the like, converts an AC voltage input via a powercable (not shown) to a DC voltage required by the various units withinthe cradle 20 and supplies the voltage resulting from the conversion tothe various blocks. In addition, the external power source circuit 158supplies the digital camera 10A with a charging current to be used tocharge the rechargeable battery in the digital camera 10A via the camerainterface 160.

When the digital camera 10A is set on the cradle 20, the camerainterface 160 engages in data communication with the digital camera 10Aor supplies the charging current to the digital camera 10A in responseto a command from the CPU 151. The camera interface 160 includes acontrol interface (Control I/F) line through which control signals areexchanged, a video interface (VIDEO I/F) line through which videosignals are exchanged, a digital interface (Digital I/F) line throughwhich image data and audio data (digital signals) are exchanged and apower line through which the charging current is supplied.

In response to a command issued by the CPU 151, sound is reproducedthrough the speaker 159 by using audio data output from the CPU 151 ortransmitted from the digital camera 10A via the camera interface 160.The operation member 153 outputs an operation signal corresponding to aspecific switch having been operated to the CPU 151.

Since the projector unit 120 assumes a structure similar to that shownin FIG. 3, its explanation is omitted. The projector unit 120 starts aprojection operation upon receiving a projection command output from theCPU 151 in response to a projection start operation signal input to theCPU 151 from the operation member 153 or a projection start instructionsignal input to the CPU 151 from the digital camera 10A via the camerainterface 160.

In response to a command from the CPU 151, an image originating from aspecific source among sources (1) through (3) described below isprojected via the projector unit 120.

(1) An image reproduced by using image data originating from the memorycard 250 or the internal memory (not shown) in the digital camera 10Atransmitted from the digital interface (Digital I/F) line at the camerainterface 160

(2) An image reproduced by using video signals transmitted from thedigital camera 10A via the video interface (VIDEO I/F) line at thecamera interface 160.

(3) An image reproduced by using image data recorded in the memory card154 at the cradle 20.

(Electronic Camera)

The digital camera 10A in FIG. 7 includes an imaging unit 220, a CPU101A, a memory 102, an operation member 103, an external interface (I/F)107, a microphone 106, a speaker 105, a liquid crystal display unit 104,a battery 109, a charging circuit 108 and a cradle interface 110. Thememory card 250 and the tuner card 255 are loaded and unloaded at memoryslots (not shown), as necessary. The external structure of the digitalcamera 10A is similar to that of the digital camera 10 in FIGS. 1 and 2and it adopts a structure that allows the cradle interface 110 to beexposed to the outside as necessary. However, it does not include aprojector unit and accordingly, it is not equipped with a projectionwindow 13 either. The same reference numerals are assigned to blocksconstituting the digital camera 10A that are similar to the blocks inthe structure shown in FIG. 3 to preclude the necessity for a repeatedexplanation thereof.

The CPU 101A controls the camera operations by executing specificarithmetic operations on signals input from the individual unitsconstituting the digital camera 10A and providing the resulting controlsignals to the various units of the digital camera 10A based upon acamera control program. It is to be noted that the camera controlprogram is stored in a nonvolatile memory (not shown) within the CPU101A.

The battery 109 is a rechargeable battery that supplies power to variousunits where power is required in the digital camera 10A. The chargingcircuit 108 charges the battery 109 with the charging current suppliedfrom the cradle 20 via the cradle interface 110.

The cradle interface 110 engages in data communication with the cradle20 and/or receives the charging current from the cradle while thedigital camera 10A is mounted at the cradle 20. The cradle interface 110includes a control interface (Control I/F) line through which controlsignals are exchanged, a video interface (VIDEO I/F) line through whichvideo signals are exchanged, a digital interface (Digital I/F) linethrough which image data and audio data are exchanged and a power linethrough which the charging current is supplied.

Video signals are generated by the CPU 101A to display an image, menuinformation or the like at the liquid crystal display unit 104. Imagedata obtained at the imaging unit 220 can be recorded into the memorycard 250 or transmitted to the cradle 20 via the cradle interface 110.Audio data collected at the microphone 106, too, can be recorded intothe memory card 250 or transmitted to the cradle 20 via the cradleinterface 110 together with the image data.

The operation modes of the digital camera 10A include a photographingmode and a reproduction operation mode for reproducing images by usingphotographic image data. Since the digital camera is not equipped with aprojector unit, a projection mode does not need to be available. Thedigital camera 10A is switched from a given operation mode to another inresponse to an operation of the mode selector dial 15 at the operationmember 103.

As the digital camera 10A mounted at the cradle 20 is switched to thereproduction operation mode in the digital camera system describedabove, the CPU 101A of the digital camera 10A sets the projector unit120 at the cradle 20 in an operation-enabled state (by supplying powerand turning on the LED light source 123 to enter a projection-readystate). The CPU 101A also transmits a projection start instructionsignal to the cradle 20 via the cradle interface 110. In response, theCPU 151 at the cradle 20 engages the projector unit 120 to sequentiallyproject a plurality of reproduced images originating from the source (1)described above (images reproduced by using image data corresponding toa plurality of image files stored in the memory card 250 or the internalmemory (not shown) at the digital camera 10A) in a slide-show. It is tobe noted that the image data used for the image reproduction may includeboth still images and dynamic images. Alternatively, reproduced imagesoriginating from the source (2) or the source (3) may be projected in aslide-show. As a further alternative, instead of sequentially projectinga plurality of reproduced images in a slide-show, a specific image(e.g., the image most recently photographed with the digital camera 10A)stored in the memory card 250 or the internal memory (not shown) at thedigital camera 10A may be projected.

While the digital camera 10A is set on the cradle 20 which is used tocharge the battery 109 in the digital camera 10A and also includes theprojector unit 120 for projecting reproduced images in the explanationgiven above, the present invention may also be adopted in a system inwhich the digital camera 10A is connected to a projection display deviceinstead of the cradle 20, which is equipped with the projector unit 120but does not include a charging circuit.

As the operation mode of the cradle 20 is switched from a charge modefor supplying the charging current to the digital camera 10A to aprojection mode for projecting a reproduced image via the projector unit120, the CPU 151 at the cradle 20 transmits a signal constituting aninstruction to retract the lens barrel P (see FIG. 1) to the digitalcamera 10A via the camera interface 160 at the projection start. Inresponse, the CPU 101A at the digital camera 10A outputs a retractcommand (instruction) to the photographing control circuit 224 so as toretract the lens barrel P.

The cradle 20 may adopt a structure that allows it to concurrentlycharge the battery 109 built into the digital camera 10A and projectimages via the projector unit 120. In addition, the projector unit 120may be driven on power supplied by the external power source circuit 158instead of the battery 109 built into the digital camera 10A to reducethe power consumption at the battery 109.

(Variation 1)

The cradle 20 may automatically shift from the charge mode to theprojection mode once the battery 109 in the digital camera 10A becomesfully charged. In such a case, upon receiving a signal indicating acharge end provided by the CPU 101A of the digital camera 10A, the CPU151 should transmit to the digital camera 10A a signal instructing thatthe lens barrel P (see FIG. 1) be retracted and should also sequentiallyproject a plurality of reproduced images originating from the source (1)in a slide-show via the projector unit 120. Alternatively, it mayproject reproduced images corresponding to the source (2) or the source(3) in a slide-show. As a further alternative, instead of sequentiallyprojecting a plurality of reproduced images in a slide-show, a specificimage (e.g., the image most recently photographed with the digitalcamera 10A) stored in the memory card 250 or the internal memory (notshown) at the digital camera 10A may be projected.

(Variation 2)

Alternatively, the cradle 20 may automatically shift into the projectionmode as the digital camera 10A is placed on the cradle 20. For instance,the signal level at a specific terminal within the camera interface 160may be detected over predetermined time intervals and a decision may bemade as to whether or not the digital camera 10A is currently set on thecradle 20 based upon the detected signal value. In such a case, upondetecting that the digital camera 10A is currently set on the cradle 20,the CPU 151 should transmit to the digital camera 10A a signalinstructing that the lens barrel P (see FIG. 1) be retracted, set theprojector unit 120 in a projection-ready state and sequentially projecta plurality of reproduced images originating from the source (1) in aslide-show. It may instead project reproduced images corresponding tothe source (2) or the source (3) in a slide-show. As a furtheralternative, instead of sequentially projecting a plurality ofreproduced images in a slide-show, a specific image (e.g., the imagemost recently photographed with the digital camera 10A) stored in thememory card 250 or the internal memory (not shown) at the digital camera10A may be projected. By adopting a structure that automaticallyretracts the lens barrel P as described above, the camera operations canbe simplified and, at the same time, it is ensured that the lens barrelP is never present within the range of the angle of field of theprojected light when the lens barrel P is set along the direction inwhich images are projected via the projector unit.

(Variation 3)

The presence of the digital camera 10A on the cradle 20 may be detectedvia a detection switch 1000 which may be, for instance a microswitch(see FIG. 7). In this case, the CPU 151 detects the level of a signaloutput from the microswitch 1000 and makes a decision as to whether ornot the digital camera 10A is currently set on the cradle 20 based uponthe detected signal value. If it is determined that the digital camera10A is set on the cradle 20, the CPU 151 transmits a signal constitutingan instruction that the lens barrel P (see FIG. 1) be retracted to thedigital camera 10A, selects the projection mode as the operation modeand sequentially projects a plurality of reproduced images originatingfrom the source (1) in a slide-show via the projector unit 120.Alternatively, it may project reproduced images corresponding to thesource (2) or the source (3) in a slide-show. As a further alternative,instead of sequentially projecting a plurality of reproduced images in aslide-show, a specific image (e.g., the image most recently photographedwith the digital camera 10A) stored in the memory card 250 or theinternal memory (not shown) at the digital camera 10A may be projected.

Third Embodiment

The present invention may be adopted in a digital camera system thatincludes a digital camera equipped with a projector and a digital cameraauxiliary device which is not equipped with a built-in projector device.FIG. 8 is a block diagram of such a digital camera system with a digitalcamera 10B equipped with a projector set on a cradle 20A. The samereference numerals are assigned to members in FIG. 8 identical to thosein FIG. 7 in reference to which the second embodiment has been explainedand their explanation is omitted. The digital camera 10B adopts anexternal structure similar to that of the digital camera 10 in FIGS. 1and 2 and includes a cradle interface 110 that can be exposed to theoutside as necessary.

A CPU 101B of the digital camera 10B makes a decision as to whether ornot the digital camera 10B is currently set on the cradle 20A. Thepresence/absence of the digital camera 10B on the cradle may be judgedbased upon the signal value detected at a specific terminal within thecradle interface 110. A signal indicating the operating state of themicroswitch 1000 disposed at the cradle 20A is transmitted to thespecific terminal from a CPU 151A of the cradle 20A.

Upon judging that the digital camera 10B is currently set on the cradle20A, the CPU 101B transmits to the imaging unit 220 a signal instructingthat the lens barrel P (see FIG. 1) be retracted, also transmits aprojection start instruction signal to the projector unit 120 andsequentially projects a plurality of reproduced images originating fromthe source (1) in a slide-show. More specifically, the CPU 101B engagesthe projector unit 120 to sequentially project a plurality of reproducedimages originating from the source (1) described above (imagesreproduced by using image data corresponding to a plurality of imagefiles stored in the memory card 250 or the internal memory (not shown)at the digital camera 10B) in a slide-show. It is to be noted that theimage data used for the image reproduction may include both still imagesand dynamic images. Alternatively, reproduced images originating fromthe source (2) or the source (3) may be projected in a slide-show. As afurther alternative, instead of sequentially projecting a plurality ofreproduced images in a slide-show, a specific image (e.g., the imagemost recently photographed with the digital camera 10B) stored in thememory card 250 or the internal memory (not shown) at the digital camera10B may be projected.

The detection switch 1000 used to judge whether or not the digitalcamera 10B is set on the cradle 20A may be disposed at the digitalcamera 10B instead. In such a case, the CPU 101B directly detects thelevel of the signal from the detection switch 1000 instead of checkingthe signal level via the specific terminal in the cradle interface 110and makes a decision as to whether or not the digital camera 10B is seton the cradle based upon the detected signal value.

Fourth Embodiment

The following is an explanation of the fourth embodiment of the presentinvention given in reference to drawings. FIG. 9 is a perspective of adigital camera equipped with a projector achieved in the fourthembodiment of the present invention, viewed from the front side. Asshown in FIG. 9, a photographic lens 11, an illuminating light window 12and a projection window 13 are disposed at the front side of an digitalcamera 10C equipped with the projector. At the top surface (the surfaceof the casing turned to the upper side when the digital camera 10C isheld sideways) of the digital camera 10C equipped with the projector, ashutter release button 14, a zoom switch 23, a mode selector dial 15 anda main switch 22 are disposed.

FIG. 10 is a perspective of the digital camera 10C equipped with theprojector in FIG. 9, viewed from the rear side. As shown in FIG. 10, aliquid crystal display unit 17, an electronic viewfinder 18, operationmembers 19 and speaker holes 20 are disposed at the rear surface (towardthe photographer) of the digital camera 10C equipped with the projector.

FIG. 11 is a block diagram of the structure adopted in the digitalcamera 10C equipped with the projector described above. As shown in FIG.11, the digital camera 10C equipped with the projector includes aprojector unit 120, an imaging unit 220, a CPU 101C, a memory 102, anoperation member 103, a liquid crystal display unit 104, a speaker 105,a microphone 106, an external interface (I/F) 107 and an illuminatingdevice 108. A memory card 200 and a wireless communication unit 210 areloaded in card slots (not shown). The memory card 200 and the wirelesscommunication unit 210 can both be loaded and unloaded freely.

It is to be noted that the same reference numerals are assigned tocomponents in FIGS. 9 through 11 with functions similar to those inFIGS. 1 through 3 in reference to which the first through thirdembodiments have been explained, so as to preclude the necessity for adetailed explanation thereof.

The CPU 101C controls the photographing operation and the projectionoperation by executing specific arithmetic operations on signals inputfrom the individual units constituting the digital camera 10C equippedwith the projector and providing the resulting control signals to thevarious units of the digital camera 10C equipped with the projector,based upon a control program. It is to be noted that the control programis stored in a nonvolatile memory (not shown) within the CPU 101C.

The memory 102 is utilized as a work area by the CPU 101C. The operationmember 103 corresponds to the main switch 22, the shutter release button14, the zoom switch 23 and the mode selector dial 15 in FIG. 9 and alsocorresponds to the operation members 19 in FIG. 10. The operation member103 includes a halfway press switch and a full press switch (neithershown) that enter an ON state by interlocking with depression of theshutter release button 14. The halfway press switch enters an ON stateas the shutter release button 14 is depressed to an extent correspondingto a halfway press operation, whereas the full press switch enters an ONstate when the shutter release button 14 is depressed to an extentcorresponding to a full press operation, which is greater than theextent corresponding to the halfway press operation. Operation signalscorresponding to specific operation details are transmitted from theoperation member 103 to the CPU 101C.

The memory card 200 is constituted with a nonvolatile memory such as aflash memory, and data such as image data obtained by the imaging unit220 through a photographing operation can be written and saved into thememory card 200 or such image data can be read out from the memory card200 in response to a command issued by the CPU 101C. The wirelesscommunication unit 210 receives data transmitted from an externalapparatus (not shown), modulates the received data and outputs the imagedata and the audio data having undergone the modulation process to theCPU 101C.

(Imaging Unit)

The imaging unit 220 includes a photographic lens 221 (corresponds toreference numeral 11 in FIG. 9), an image sensor 222, a lens drivecircuit 223, a photographing control circuit 224 and a lens barrelretracting mechanism 225. The image sensor 222 may be a CCD or CMOSimaging element. The photographing control circuit 224 controls thedrive of the image sensor 222 and the lens drive circuit 223 based uponcommands issued by the CPU 101C and executes specific types of imageprocessing on imaging signals (electrical charge storage signals) outputfrom the image sensor 222. The image processing includes white balanceprocessing and gamma processing.

The photographic lens 221 forms a subject image onto the imaging surfaceof the image sensor 222. The photographing control circuit 224 engagesthe image sensor 222 to start an imaging operation in response to aphotographing start instruction, reads out the electrical charge storagesignals from the image sensor 222 once the imaging operation iscompleted and outputs the image data resulting from the image processingdescribed above to the CPU 101C.

The lens drive circuit 223 drives forward/backward the focus lens (notshown) constituting part of the photographic lens 221 along the opticalaxis based upon a focus adjustment signal output from the photographingcontrol circuit 224. In addition, upon receiving a zoom adjustmentsignal provided by the photographing control circuit 224, the lens drivecircuit 223 drives the zoom lens (not shown) constituting thephotographic lens 221 along the optical axis (toward the telephoto sideor the wide-angle side), as indicated by the zoom adjustment signal.Extents of focus adjustment and zoom adjustment to be achieved areindicated to the photographing control circuit 224 by the CPU 101C.

(Focus Adjustment in the Camera)

The imaging unit 220 adjusts the focus of the photographic lens 221 byshifting the focus lens constituting the photographic lens 221 along theoptical axis. For auto focus adjustment, the CPU 101C outputs to thephotographing control circuit 224 a focus adjustment signal so as toachieve a maximum cumulative value (a focal point evaluation value) ofthe values of the high-frequency component indicated in the imagesignals corresponding to a focus detection area (e.g., the central areaof the photographic image plane) among the image signals obtained bycapturing an image at the image sensor 222. The focus lens position atwhich the focal point evaluation value peaks is equivalent to thefocus-match position at which the highest contrast is achieved in theimage captured by the image sensor 222 with the minimum level ofblurring around the edges in the image.

(Zoom Adjustment in the Camera)

The imaging unit 220 executes an optical zoom adjustment for thephotographic lens 221 by shifting the zoom lens constituting part of thephotographic lens 221 along the optical axis. In response to anoperation signal output via the zoom switch 23, the CPU 101C transmits azoom adjustment signal to the photographing control circuit 224. The CPU101C transmits a zoom adjustment signal indicating a zoom up if a rightturn operation signal has been input from the zoom switch 23 andtransmits a zoom adjustment signal indicating a zoom down if a left turnoperation signal has been input from the zoom switch 23. The zoom switch23 assumes a structure that allows it to selectively output either ofthe two different operation signals.

In addition, in response to a command issued by the CPU 101C, thephotographing control circuit 224 outputs a command to the lens barrelretracting mechanism 225 so as to retract the lens barrel P (see FIG. 9)of the photographic lens 221 into the casing of the digital camera 10Cequipped with the projector or extend the lens barrel P currentlyretracted in the casing to the photographing position (see FIG. 9).

(Projector Unit)

The projector unit 120 includes a projection lens 121, a liquid crystalpanel 122, an LED light source 123, a projection control circuit 124 anda lens drive circuit 125. The projection control circuit 124 supplies adrive current to the LED light source 123 in response to a projectioncommand output by the CPU 101C. The LED light source 123 illuminates theliquid crystal panel 122 with a brightness that corresponds to thesupplied current.

In addition, the projection control circuit 124 generates a liquidcrystal panel drive signal in correspondence to image data output fromthe CPU 101C and drives the liquid crystal panel 122 with the drivesignals thus generated. More specifically, a voltage corresponding tothe image signal is applied to each of the pixels at the liquid crystallayer. By modulating the voltage applied to the liquid crystal layeralters the liquid crystal molecular arrangement thereby changing thelight transmittance at the liquid crystal layer. By modulating the lightfrom the LED light source 123 in correspondence to the image signal asdescribed above, an optical image is generated through the liquidcrystal panel 122.

The optical image originating from the liquid crystal panel 122 isprojected via the projection lens 121 toward a screen or the likedisposed outside the digital camera 10C equipped with the projector. Thelens drive circuit 125 drives forward/backward the projection lens 121along a direction perpendicular to the optical axis based upon an offsetadjustment signal output from the projection control circuit 124. Inaddition, the lens drive circuit 125 drives forward/backward the focuslens (not shown) constituting part of the projection lens 121 along theoptical axis based upon a focus adjustment signal output from theprojection control circuit 124. The lens drive circuit 125 also drivesforward/backward the zoom lens (not shown) constituting part of theprojection lens 121 along the optical axis based upon a zoom adjustmentsignal output from the projection control circuit 124. The extents ofoffset adjustment, focus adjustment and zoom adjustment to be achievedare indicated by the CPU 101C to the projection control circuit 124.

(Offset of Projection Image)

As the projection lens 121 is shifted along the direction perpendicularto the optical axis, the direction along which the light flux from theprojector unit 120 advances changes, thereby offsetting the projectionimage. The projection image may be offset by shifting the liquid crystalpanel 122 and the LED light source 123 along the direction perpendicularto the optical axis, instead of by shifting the projection lens 121.Namely, the projection image may be offset by altering the positionalrelationship between the projection lens 121 and the liquid crystalpanel 122 along the direction perpendicular to the optical axis.

(Keystone Correction of Projection Image)

When shifting the projection lens 121, the liquid crystal panel 122 orthe LED light source 123 along the direction perpendicular to theoptical axis, the projection data undergo keystone correction incorrespondence to the extent of the shift. If the projection image issimply offset as described above, the projection image will assume atrapezoidal shape, and for this reason, the CPU 101C needs to executeelectrical keystone correction through image processing so as to correctthe shape of the projection image, i.e., so as to adjust it from thetrapezoidal shape to a rectangular shape. Initial correction values tobe used to correct the shapes of projection images to a rectangularshape are stored in advance in the memory in the CPU 101C. The CPU 101Creads out the initial correction value corresponding to the extent ofthe offset adjustment, executes keystone correction processing for theprojection image data in the memory 102 based upon the initialcorrection value thus read out and outputs the image data havingundergone the keystone correction processing to the projection controlcircuit 124.

(Focus Adjustment for Projection Image)

As the focus lens constituting part of the projection lens 121 isshifted along the optical axis, the projector unit 120 adjusts the focusof the projection image. The CPU 101C transmits a focus adjustmentsignal corresponding to an operation signal from the operation member103 to the projection control circuit 124 for manual focus adjustment.

For auto focus adjustment, the CPU 101C outputs to the projectioncontrol circuit 124 a focus adjustment signal so as to achieve a maximumcumulative value (a focal point evaluation value) of the values of thehigh-frequency component indicated in the image signals corresponding toa focus detection area (e.g., the central area of the photographic imageplane) among the image signals obtained by capturing an image at theimaging unit 220. The focus lens position at which the focal pointevaluation value peaks is equivalent to the focus adjustment position atwhich the highest contrast is achieved in the projection subject imagewith the minimum level of blurring around the edges in the image.

(Zoom Adjustment for Projection Image)

As the zoom lens constituting part of the projection lens 121 is shiftedalong the optical axis, the projector unit 120 executes zoom adjustmentfor the projection image. The CPU 101C transmits a zoom adjustmentsignal corresponding to an operation signal from the operation member103 to the projection control circuit 124.

(Projection Sources)

In response to a command issued by the CPU 101C, the projector unit 120reproduces and projects content corresponding to a specific source among(source 1) through (source 5) described below. The CPU 101C outputsimage data to be used to project an image corresponding to a specificsource so that each time a source changeover operation signal is inputfrom the operation member 103, the image projection is switchedcyclically to project images corresponding to sources (1) through (4) inthe order of (1)→(2)→(3)→(4)→(1) . . . . However, the source (1) isskipped if the memory card 200 is not loaded in the digital camera 10Cequipped with the projector and the source (2) is skipped if thewireless communication unit 210 is not loaded. In addition, the source(4) is skipped if no external apparatus is connected to the externalinterface (I/F) 107.

Also, in response to a changeover operation signal indicating achangeover to chart projection, which is input from the operation member103, the CPU 101C outputs image data originating from the source (5)detailed below to the projector unit 120.

(source 1) An image reproduced by using data read out from the memorycard 200

(source 2) An image reproduced by using data received at the wirelesscommunication unit 210

(source 3) An image reproduced by using image data recorded in theinternal memory (such as the non-volatile memory in the CPU 101C)

(source 4) An image reproduced by using data input through the externalinterface (I/F) 107

(source 5) A chart used in the focus adjustment, such as an image of ablack and white stripe pattern

When an image corresponding to the source (1) or the source (3) is to beprojected, the CPU 101C reads out the image data corresponding to themost recent recording date (the image data most recently photographedamong the recorded image data) from the memory card 200 (or the internalmemory) and outputs the image data thus read out to the projector unit120.

Since the present invention is characterized by the operations executedwhen the projection mode is selected in the digital camera 10C equippedwith the projector, the following explanation focuses on the controlexecuted by the CPU 101C as the projection mode is selected.

FIG. 12 presents a flowchart of the processing executed in conformanceto the program by the CPU 101C of the digital camera 10C equipped withthe projector in the projection mode. The processing shown in FIG. 12starts as an operation signal indicating a changeover to the projectionmode is input to the CPU 101C from the mode selector dial 15.

In step S1 in FIG. 12, the CPU 101C outputs an imaging unit OFFinstruction to the photographing control circuit 224 and also issues adisplay OFF instruction for the liquid crystal display unit 104 beforethe operation proceeds to step S2. As a result, the imaging operation atthe imaging unit 220 stops and the display at the liquid crystal displayunit 104 is turned off.

In step S2, the CPU 101C makes a decision as to whether or not the lensbarrel P is currently in a retracted state. If a signal indicating aretracted state is received from the photographing control circuit 224,the CPU 101C makes an affirmative decision in step S2 to proceed to stepS4A, whereas it makes a negative decision in step S2 if a signalindicating a non-retracted state is received to proceed to step S3.

In step S3, the CPU 101C outputs a retract command (instruction) to thephotographing control circuit 224, and then the operation proceeds tostep S4A. In step S4A, the CPU 101C issues a projection startinstruction to the projection control circuit 124 and effects functionadjustments at the shutter release button 14 and the zoom switch 23constituting the operation member 103 and disposed at the top surface ofthe digital camera 10C equipped with the projector before the operationproceeds to step S5. In response to the projection start instruction,the LED light source 123 is turned on at the projector unit 120.

Following step S4A, the shutter release button 14 and the zoom switch 23are used as operation members with functions different from those in thephotographing mode until the function adjustments are cleared in stepS11 as described later. While the function adjustments are in effect,the shutter release button 14 does not function as an operation memberoperated to issue a photographing instruction, but instead functions asan operation member operated to start autofocus adjustment for theprojection image, switch to project a chart image corresponding to thesource (5) for focus adjustment, rotate the projection image or pausethe projection operation. Instead of functioning as the zoom adjustmentoperation member operated to adjust the zoom at the photographic lens221, the zoom switch 23 functions as an operation member operated forzoom adjustment at the projection lens 121, i.e., for zoom adjustment ofthe projection image.

In step S5, the CPU 101C reads out the image data with the most recentrecording date from the memory card 200 and outputs the image data thusread out to the projector unit 120 before the operation proceeds to stepS6. It is to be noted that while image data are read out from the memorycard 200 at the default setting, the default setting may be modified soas to read out image data from the internal memory at the CPU 101C. As aresult, an image reproduced by using the image data output by the CPU101C to the projector unit 120 is projected. It is also to be noted thatif audio data are stored in correspondence to the data file of thecurrently projection image, the CPU 101C reproduces sound through thespeaker 105 by using the audio data. The stored image data may containboth still image data files and dynamic image data files.

In step S6, the CPU 101C makes a decision as to whether or not a useroperation has been performed. The CPU 101C makes an affirmative decisionin step S6 if an operation signal has been input through the operationmember 103 (see FIG. 11) to proceed to step S7, whereas it makes anegative decision in step S6 if no operation signal has been inputthrough the operation member 103 to proceed to step S9.

In step S9, the CPU 101C makes a decision as to whether or not the imagedata output to the projector unit 120 originate from either the source(1) or the source (3) (i.e., whether or not the image data output to theprojector unit are a recorded image. The CPU 101C makes an affirmativedecision in step S9 if the image data output to the projector unit 120are a recorded image to proceed to step S10, whereas it makes a negativedecision in step S9 if the image data output to the projector unit 120are an image from either the source (2) or the source (4), i.e., anunrecorded image to return to step S6.

In step S10, the CPU 101C makes a decision as to whether or not the timeis up. If a specific length of time (e.g., 5 seconds) has been countedon an internal timer, the CPU 101C makes an affirmative decision in stepS10 to return to step S5. If, on the other hand, the specific length oftime has not elapsed, a negative decision is made in step S10 to returnto step S6. It is to be noted that the length of time counted prior tothe time-up indicates the length of time having elapsed after readingout the data corresponding to the currently projection image.

The operation returns to step S5 from step S1 to execute a slide-showprojection. Namely, an image reproduced by using image data read outfrom the memory card 200 (or the internal memory) is projected, after 5seconds elapses, the next image data are read out from the memory card200 (or the internal memory) and the image projection is updated withthe image reproduced by using the most recently read out image data. Itis to be noted that the length of the projection time per image duringthe slide-show projection does not need to be 5 seconds, and the lengthof the projection time can be adjusted as necessary.

In step S7, to which the operation proceeds after making an affirmativedecision in step S6, the CPU 101C makes a decision as to whether or notthe user has performed a mode switching operation. The CPU 101C makes anaffirmative decision in step S7 if the operation signal has been inputfrom the mode selector dial 15, indicating a changeover to thephotographing mode, and in this case, the operation proceeds to stepS11. If source changeover operation signals from the shutter releasebutton 14 and the zoom switch 23 have been input, e.g., if an operationsignal from the zoom switch 23 and a halfway press operation signal fromthe shutter release button 14 have been input simultaneously, the CPU101C makes a negative decision in step S7 to proceed to step S8.Moreover, if an operation signal has been input either from the shutterrelease button 14 or the zoom switch 23, the CPU 101C also makes anegative decision in step S7 and in this case, the operation proceeds tostep S12. The operation proceeds to step S8 on the assumption that asource changeover instruction has been issued, whereas the operationproceeds to step S12 on the assumption that a projection adjustmentinstruction has been issued.

In step S11, the CPU 101C issues a projection end instruction to theprojection control circuit 124 and clears the function adjustments atthe shutter release button 14 and the zoom switch 23, thereby ending theprocessing in FIG. 12. As the processing ends, the LED light source 123at the projector unit 120 goes off. It is to be noted that if theprojection contents have originated from the source (1), the data havingbeen read out from the memory card 200 are not saved in the memory 102.If the projection contents have originated from the source (2), the datahaving been received at the wireless communication unit 210 are notsaved in the memory 102. In addition, if the projection contents haveoriginated from the source (4), the data having been received via theexternal interface 107 are not saved in the memory 102.

In step S8, the CPU 101C switches the source of the image data to beoutput to the projector unit 120 by one setting so that the sources areswitched in the order of; (source 1)→(source 2)→(source 3)→(source4)→(source 1) . . . , each time an operation signal from the zoom switch23 and a halfway press operation signal from the shutter release button14 are simultaneously input. Then the operation proceeds to step S9.

In step S12, the CPU 101C executes projection adjustment processing andthen the operation proceeds to step S9. The projection adjustmentprocessing is now explained in detail in reference to the flowchartpresented in FIG. 13. In step S51 in FIG. 13, the CPU 101C makes adecision as to whether or not the user has operated the zoom switch 23at the operation member 103. The CPU 101C makes an affirmative decisionin step S51 if the operation signal input thereto has originated fromthe zoom switch 23 to proceed to step S52, whereas it makes a negativedecision in step S51 if the operation signal has not originated from thezoom switch 23 to proceed to step S53.

In step S52, the CPU 101C executes optical zoom processing, beforereturning to step S51. The CPU 101C may execute the optical zoomprocessing by, for instance, outputting a zoom adjustment signal to theprojection control circuit 124 so as to zoom up the projection image ifthe zoom switch 23 has been turned to the right and outputting a zoomadjustment signal to the projection control circuit 124 so as to zoomdown the projection image if the zoom switch 23 has been turned to theleft.

In step S53, the CPU 10C makes a decision as to whether or not the userhas pressed the shutter release button 14 halfway down (i.e., whether ornot an operation signal has been output from the halfway press switch).The CPU 101C makes an affirmative decision in step S53 if the operationsignal input thereto is a halfway press operation signal to proceed tostep S54, but makes a negative decision in step S53 if a halfway pressoperation signal has not been input to proceed to step S56.

In step S54, the CPU 101C makes a decision as to whether or not theshutter release switch has been held down. The CPU 101C makes a negativedecision in step S54 if the halfway press operation signal has beencleared within a predetermined length of time (e.g., 3 seconds) toproceed to step S55, whereas it makes an affirmative decision in stepS54 if the halfway press operation signal has been sustained over alength of time equal to or greater than the predetermined length of timeto proceed to step S59.

A halfway press operation signal generated when the shutter releasebutton 14 has been pressed halfway down without being held down over asignificant length of time is equivalent to an autofocus (AF)instruction. In step S55, the CPU 101C starts AF processing, and thenthe operation returns to step S51. More specifically, it issues animaging unit ON instruction to the photographing control circuit 224 andalso transmits a focus adjustment signal to the projection controlcircuit 124 so as to achieve the maximum value for the focal pointevaluation value calculated based upon image signals provided by theimaging unit 220. It is to be noted that once the AF processing iscompleted, the CPU 101C issues an imaging unit OFF instruction to thephotographing control circuit 224.

A halfway press operation signal generated when the shutter releasebutton 14 has been pressed halfway down and held at the halfway pressposition is equivalent to a chart projection ON/OFF switchinginstruction. In step S59, the CPU 101C makes a decision as to whether ornot the chart for the focus adjustment originating from the source (5)is currently projected. If the chart image is being projected, i.e., ifthe focus adjustment chart image data have already been output to theprojector unit 120, the CPU 101C makes an affirmative decision in stepS59 to proceed to step S60, whereas it makes a negative decision in stepS59 if a reproduced image originating from any source among the source(1) through the source (4) is currently being projected to proceed tostep S61.

In step S60, the CPU 101C turns off the chart projection. Namely, itoutputs to the projector unit 120 the image data originating from aspecific source among the source (1) through the source (4), which havebeen most recently projected prior to the chart image projection, so asto project a reproduced image by using the image data instead of thechart image. The operation then returns to step S51.

In step S61, the CPU 101C turns on chart projection. Namely, it outputsto the projector unit 120 the chart image data from the source (5) so asto project the chart image instead of the currently projected reproducedimage originating from a source among the source (1) through the source(4), before returning to step S51.

In step S56, the CPU 101C makes a decision as to whether or not the userhas pressed the shutter release button 14 all the way down, i.e.,whether or not an operation signal has been output from the full pressswitch. The CPU 101C makes an affirmative decision in step S56 if theoperation signal input thereto is a full press operation signal toproceed to step S57. However, it makes a negative decision in step S56if a full press operation signal has not been input, ends the processingin FIG. 13 and proceeds to step S9 in FIG. 12.

In step S57, the CPU 101C makes a decision as to whether or not theshutter release switch has been held down. The CPU 101C makes a negativedecision in step S57 if the full press operation signal has been clearedwithin a predetermined length of time (e.g., 3 seconds) to proceed tostep S58, whereas it makes an affirmative decision in step S57 if thefull press operation signal has been sustained over a length of timeequal to or greater than the predetermined length of time to proceed tostep S62.

A full press operation signal generated when the shutter release button14 has been pressed all the way down without holding it at the fullpress position over a significant length of time is equivalent to aprojection image rotation instruction. In step S58, the CPU 101C rotatesthe projection image as explained below, before returning to step S51.

(Rotation of Projection Image)

The CPU 101C rotates the image data by 90° in the clockwise direction inthe memory 102 and outputs the image data having undergone the rotationprocessing to the projector unit 120. The CPU 101C also executes sizeconversion processing based upon the aspect ratio of the projectionimage so as to ensure that the rotated image is contained within theprojection range. For instance, if the aspect ratio of the image data is4 (lateral):3 (longitudinal) and the aspect ratio of the liquid crystalpanel 122, too, is 4 (lateral):3 (longitudinal), the data size of therotated image is reduced by a factor of ¾ with regard to the numbers ofpixels along the longitudinal and lateral directions. As a result, animage having undergone the rotation processing and the reductionprocessing so as to match the length of the longer side of the imageplane with the shorter side of the liquid crystal panel 122 is projected(see FIGS. 5 and 6).

The CPU 101C repeatedly executes the size conversion processing and therotation processing described above each time a projection imagerotation instruction is input. As the size conversion processing,reduction processing for reducing the numbers of pixels along thelongitudinal and the lateral directions both by a factor of ¾ (formatching the longer side of the image with the shorter side of theliquid crystal panel 122) and enlargement processing for increasing thenumbers of pixels along the longitudinal direction and the lateraldirection by a factor of 4/3 (for matching the longer side of the imageplane with the longer side of the liquid crystal panel 122) arealternately executed in correspondence to the aspect ratio mentionedearlier. Accordingly, if the projection image rotation instruction isissued four times in a row, the projection image rotates a full cycle inthe clockwise direction and after the fourth instruction, the size ofthe projection image is reset to the size it was before the firstprojection image rotation instruction was issued. It is to be noted thatthe projection image may be rotated in the counterclockwise directioninstead.

A full press operation signal generated when the shutter release button14 has been pressed all the way down and held at the full press positionis equivalent to a projection operation pause/clear changeoverinstruction. In step S62, the CPU 101C makes a decision as to whether ornot the projection operation has been paused. The CPU 101C makes anaffirmative decision in step S62 if the projection operation has beenpaused to proceed to step S63, whereas it makes a negative decision instep S62 if a projection operation is currently in progress, to proceedto step S64.

In step S63, the CPU 101C clears the paused state. More specifically,the CPU 101C outputs a command for the projection control circuit 124 toresume power supply to the LED light source 123 and the liquid crystalpanel 122, before returning to step S51. As a result, the optical imageprojection by the projector unit 120 resumes.

If the current projection contents have originated from the source (1),information with regard to the memory card 200 and the data having beenread from the memory card 200 are saved into the memory 102 during thepause. Likewise, if the current projection contents have originated fromthe source (2), the communication between the wireless communicationunit 210 and the external apparatus is sustained and the data receivedat the wireless communication unit 210 are saved into the memory 102during the pause. If the current projection contents have originatedfrom the source (4), the communication between the external interface107 and the external apparatus is sustained and the data received at theexternal interface 107 are saved into the memory 102 during the pause.Since the data are saved in the memory 102 in the event of a pause, asdescribed above, the projection can be immediately resumed by using thedata saved in the memory 102 as soon as the pause is cleared.

In step S64, the CPU 101C pauses the projection operation. Namely, theCPU 101C outputs a command for the projection control circuit 124 tostop the power supply to the LED light source 123 and the liquid crystalpanel 122, before returning to step S51. In this state, the projectorunit 120 no longer projects an optical image.

The following operational effects can be achieved in the fourthembodiment described above.

(1) As the projection mode is selected in the digital camera 10Cequipped with the projector, it automatically projects images reproducedby using image data recorded in the memory card 200 in a slide-show(steps S4A through S6, steps S9 and S10). This means that after thecamera is set in the projection mode, the user does not need to turn onthe projection lamp (the LED light source 123) or select an image to beprojected. As a result, a higher level of operability of the digitalcamera 10C equipped with the projector is assured in the projectionmode.

(2) As the projection mode is selected in the digital camera 10Cequipped with the projector, function adjustments are effected so as toallow the shutter release button 14 to function as an operation memberoperated to start autofocus adjustment for the projection image, switchthe projection image to the focus adjustment chart image originatingfrom the source (5), rotate the projection image and pause theprojection operation and to allow the zoom switch 23 to function as anoperation member operated to execute zoom adjustment of the projectionimage (step S4A). This means that the digital camera 10C does notrequire any additional operation members for a projection operation.

(3) The function adjustments described in (2) above are effected for theoperation members 14 and 23 disposed at the top surface of the casing ofthe digital camera 10C equipped with the projector. Thus, when thedigital camera 10C equipped with the projector is set on, for instance,a desk and is engaged in a projection operation, the operation members14 and 23, which can be visually checked from any direction, assurebetter operability than an operation member disposed at the rear surfaceof the casing. Furthermore, since the operation members 14 and 23disposed at the top surface of the casing can be operated withoutcausing a significant movement of the casing, the likelihood of theprojection image becoming displaced as the operation member 14 or 23 isoperated is minimal.

(4) The digital camera 10C equipped with the projector cyclicallyswitches the projection image so as to project an image originating froma specific source among the sources (1) through (4) each time a sourcechangeover instruction is issued in the projection mode. Thus, areproduced image can be projected via the projector unit 120 regardlessof the format of the image data or the image signals input to thedigital camera 10C equipped with the projector. In addition, theprojection contents can be selected through a simple operation.

In the example explained above, image data recorded in the memory card200 are selected and images reproduced by using the selected image dataare automatically projected in a slide-show when the digital camera 10Cequipped with the projector is set to the projection mode. Morespecifically, when the processing in step S5 in FIG. 12 is executed forthe first time, image data are read out from the memory card 200.Alternatively, images reproduced by using image data recorded in theinternal memory corresponding to the source (3) may be projected.

In addition, when the projection mode is selected in the digital camera10C equipped with the projector, an image corresponding to either thesource (2) or the source (4) may be selected and projected instead.

In the explanation given above, the shutter release button 14 and thezoom switch 23 are described as examples of operation members that maybe disposed at the top surface of the casing of the digital camera 10Cequipped with the projector. However, the present invention is notlimited to this example and an operation member other than the shutterrelease button 14 or the zoom switch 23 may be used as long as it islocated at the upper side when the digital camera 10C equipped with theprojector is set on a flat surface or as long as it is located on theupper side when the digital camera 10C is locked onto a tripod or thelike.

The zoom switch 23 may be constituted with a rocker switch thatselectively outputs one of two different operation signals instead ofthe rotary switch described above. In addition, it may be constitutedwith two switches independent of each other, i.e., a “zoom up” switchand a “zoom down” switch.

Combinations other than those described above may be adopted with regardto the correlations of the four individual operation modes, i.e., thehalfway press operation, the sustained halfway press operation, the fullpress operation and the sustained full press operation, eachinterlocking with a depression of the shutter release button 14, to thefour different instructions, i.e., the AF start instruction, the chartprojection ON/OFF switching instruction, the projection image rotationinstruction and the projection operation pause/clear changeoverinstruction.

(Variation 4)

When the projection mode is selected in the digital camera 10C equippedwith the projector, the zoom switch 23 may function as an operationmember to be operated to forward/reverse a frame feed for the imageprojection, instead of as the operation member to be operated to executezoom adjustment for the projection image.

In this case, the CPU 101C should read out the image data in the frameimmediately preceding the currently projection image from the memorycard 200 (or the internal memory) and output the image data thus readout to the projector unit 120 in response to a left turn operationsignal input from the zoom switch 23 while projecting an imageoriginating from the source (1) or the source (3) via the projector unit120. As a result, the currently projection image will be replaced by theimage in the immediately preceding frame projected via the projectorunit 120. The left turn operation signal is equivalent to a framereverse instruction.

The CPU 10C should read out the image data in the frame immediatelyfollowing the currently projection image from the memory card 200 (orthe internal memory) and output the image data thus read out to theprojector unit 120 in response to a right turn operation signal inputfrom the zoom switch 23 while projecting an image originating from thesource (1) or the source (3) via the projector unit 120. As a result,the currently projection image will be replaced by the image in theimmediately following frame projected via the projector unit 120. Theright turn operation signal is equivalent to a frame forwardinstruction.

(Variation 5)

As the projection mode is selected in the digital camera 10C equippedwith the projector, a function adjustment may be effected so as to allowthe zoom switch 23 to function as an operation member to be operated toexecute manual focus adjustment for the projection image.

In this case, in response to a right turn operation signal input fromthe zoom switch 23, the CPU 101C outputs a focus adjustment signal tothe projection control circuit 124 so as to move the focus lensconstituting the projection lens 121 further toward the close-up side incorrespondence to the extent to which the zoom switch 23 has beenoperated. If, on the other hand, a left turn operation signal is inputfrom the zoom switch 23, the CPU 101C outputs a focus adjustment signalto the projection control circuit 124 so as to move the focus lensfurther toward the infinity side in correspondence to the extent towhich the zoom switch 23 has been operated.

(Variation 6)

As the projection mode is selected in the digital camera 10C equippedwith the projector, a function adjustment may be effected so as to allowthe zoom switch 23 to function as an operation member to be operated toexecute keystone correction adjustment for the projection image.

In this case, in response to a right turn operation signal input fromthe zoom switch 23, the CPU 101C applies a gain greater than 1 to theinitial correction value used to correct the shape of the projectionimage to a rectangular shape in correspondence to the extent to whichthe zoom switch 23 has been operated. In addition, in response to a leftturn operation signal input from the zoom switch 23, the CPU 101Capplies a gain smaller than 1 to the initial correction value incorrespondence to the extent to which the zoom switch 23 has beenoperated. The CPU 101C then executes keystone correction processing onthe projection image data in the memory 102 based upon the initialcorrection value to which the gain has been applied and outputs theimage data having undergone the keystone correction processing to theprojection control circuit 124.

While an explanation is given above in reference to the fourthembodiment and variations 4 through 6 on an example in which the presentinvention is adopted in the digital camera 10C equipped with anintegrated projector, the present invention may also be adopted in adigital camera system in which a projector is detachably mounted on adigital camera. Under such circumstances, the digital camera systemshifts into the projection mode as the projector is mounted at anaccessory shoe (not shown) of the digital camera, thereby starting up aprogram similar to that shown in FIG. 12. It is to be noted that the CPU101C in the digital camera and the projection control circuit 124 at theprojector exchange data via a signal terminal (not shown) disposedtogether with the accessory shoe. An operation signal from the operationmember at the digital camera is transmitted to the projector side viathe signal terminal.

It is to be noted that the digital camera system may be constituted witha digital camera and a cradle (a digital camera auxiliary device) thatincludes a built-in projector, as in the second embodiment explainedearlier. In such a case, a program similar to that shown in FIG. 12 maybe started up as the digital camera set on the cradle is switched to theprojection mode, as the digital camera is set on the cradle, or as adigital camera charge via the cradle is completed. In addition, as inthe third embodiment described above, the digital camera system may beconstituted with a digital camera equipped with a projector and adigital camera auxiliary device at which the digital camera equippedwith the projector is detachably mounted.

The embodiments explained above simply represent examples and thecorrespondence between the components of the embodiments and thecomponents of the present invention does not bear any limitationswhatsoever in the interpretation of the present invention.

The above described embodiments are examples, and various modificationscan be made without departing from the scope of the invention.

What is claimed is:
 1. A digital camera comprising: a photographingdevice comprising a photographing optical system; a projector devicecomprising one of an optical system functioning as a projection opticalsystem, that is different from the photographing optical system and aprojection optical system that is different from the photographingoptical system; a switching member to switch the digital camera betweena photographing operation mode in which image data photographed by thephotographing device is captured through the photographic optical systemand a projection operation mode in which an image is projected by theprojector device through the projection optical system; an operationmember disposed at a casing of the digital camera; a function adjustmentdevice that controls a function of the operation member to function as(a) an operation member for a photographing operation when the digitalcamera is in the photographing operation mode and (b) an operationmember for a projection operation when the digital camera is in theprojection operation mode; a projection control device that controls theprojector device based upon operation of the operation member when thedigital camera is in the projection operation mode; and a photographingcontrol device controlling the photographing device based upon operationof the operation member when the digital camera is in the photographingoperation mode, wherein the operation member includes a shutter releaseoperation member that outputs operation signals each corresponding to ahalfway press operation mode or a full press operation mode, thephotographing control device controls the photographing device so as toexecute photographing processing in correspondence to a signalindicating one of the halfway press operation mode and the full pressoperation mode provided by the shutter release operation member, and theprojection control device issues one of a focus adjustment startinstruction, a reproduced image projection instruction, a projectionimage rotation instruction and a projection pause instruction for theprojector device based upon a signal indicating one of the halfway pressoperation mode and the full press operation mode provided by the shutterrelease operation member and a length of time over which the signal issustained.
 2. A digital camera system, comprising: the digital cameraaccording to claim 1; and a digital camera auxiliary device thatcomprises an interface device used to at least either communicate withthe digital camera or supply power to the digital camera.
 3. A digitalcamera system according to claim 2, wherein: upon detecting that thedigital camera is in communication with the digital camera auxiliarydevice, the projection control device issues an instruction for theprojector device to start projection.
 4. A digital camera comprising: aphotographing device comprising a photographing optical system; aprojector device comprising one of an optical system functioning as aprojection optical system, that is different from the photographingoptical system and a projection optical system that is different fromthe photographing optical system; a switching member to switch thedigital camera between a photographing operation mode in which imagedata photographed by the photographing device is captured through thephotographic optical system and a projection operation mode in which animage is projected by the projector device through the projectionoptical system; an operation member disposed at a casing of the digitalcamera; a function adjustment device that controls a function of theoperation member to function as (a) an operation member for aphotographing operation when the digital camera is in the photographingoperation mode and (b) an operation member for a projection operationwhen the digital camera is in the projection operation mode; aprojection control device that controls the projector device based uponoperation of the operation member when the digital camera is in theprojection operation mode; and a photographing control devicecontrolling the photographing device based upon operation of theoperation member when the digital camera is in the photographingoperation mode, wherein the operation member includes a shutter releaseoperation member that outputs operation signals each corresponding to ahalfway press operation mode or a full press operation mode, thephotographing control device controls the photographing device so as toexecute photographing processing in correspondence to a signalindicating one of the halfway press operation mode and the full pressoperation mode provided by the shutter release operation member, and theprojection control device issues an instruction indicating one of aplurality of projection operations based on a signal indicating one ofthe halfway press operation mode and the full press operation modeprovided by the shutter release operation member and a length of timeover which the signal is sustained.